package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，营业额是指：状态为”已完成“的订单金额合计
            LocalDateTime begintime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endtime = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amout) from ordes where order_time > beginTime and order_time < endTime and status = 5
            Map map = new HashMap<>();
            map.put("begin",begintime);
            map.put("end",endtime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0:turnover;
            turnoverList.add(turnover);

        }

        //封装返回结果
        TurnoverReportVO turnoverReportVO = new TurnoverReportVO();
        turnoverReportVO.setDateList(StringUtils.join(dateList,","));
        turnoverReportVO.setTurnoverList(StringUtils.join(turnoverList,","));
        return turnoverReportVO;
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的新增用户数量 select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();
        //存放每天的总用户数量 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {


            LocalDateTime begintime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endtime = LocalDateTime.of(date, LocalTime.MAX);


            Map map = new HashMap();
            map.put("end",endtime);

            //总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin",begintime);
            //新增用户数量
            Integer newUser = userMapper.countByMap(map);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        //封装返回结果
        UserReportVO userReportVO = new UserReportVO();
        userReportVO.setDateList(StringUtils.join(dateList,","));
        userReportVO.setTotalUserList(StringUtils.join(totalUserList,","));
        userReportVO.setNewUserList(StringUtils.join(newUserList,","));

        return userReportVO;
    }

    /**
     * 统计指定时间区间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //存放从begin到end之间的每天对应的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单总数
        List<Integer> orderConutList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validOrderConutList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            //查询每天的订单总数 select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime,endTime,null);

            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = 5
            Integer validOrdersCount = getOrderCount(beginTime,endTime,Orders.COMPLETED);

            orderConutList.add(orderCount);
            validOrderConutList.add(validOrdersCount);

        }

        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderConutList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderConutList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        OrderReportVO orderReportVO = new OrderReportVO();
        orderReportVO.setDateList(StringUtils.join(dateList,","));
        orderReportVO.setOrderCountList(StringUtils.join(orderConutList,","));
        orderReportVO.setValidOrderCountList(StringUtils.join(validOrderConutList,","));
        orderReportVO.setTotalOrderCount(totalOrderCount);
        orderReportVO.setValidOrderCount(validOrderCount);
        orderReportVO.setOrderCompletionRate(orderCompletionRate);

        return orderReportVO;
    }

    /**
     * 根据条件统计订单数量
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {

        Map map = new HashMap<>();
        map.put("begin",beginTime);
        map.put("end",endTime);
        map.put("status",status);

        return orderMapper.getOrderCount(map);

    }

    /**
     * 统计指定时间区间内的销量排名前10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime,endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names,",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers,",");

        return new SalesTop10ReportVO(nameList,numberList);

    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据-----查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin,LocalTime.MIN),LocalDateTime.of(dateEnd,LocalTime.MAX));

        //2.通过POI将数据写入到EXCEL文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin+"至"+dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业额数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN),LocalDateTime.of(date,LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }


            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
